Thermostat.



J. G. WALLMANN.

THERMOSTAT.

APPLICATION FILED MAR. 18, 1913.

A TTUR/VEV 8o' of copper as its lower n nbeing brazed together. and are lheld lin placey JOH-A-N-G.' WALLMANN, OF OAKLAND, CALIFORNIA.

THERMOSTAT.

Specicaticn of Letters Patent. Paitentedot'. 6,' 1914.

Application led March 18, 1913. Serial No. 755,223.,

To all whom it mayv concern Be it known that I, JOHANN GQWALIf" MANN, a citizenof the United States, residin at the city lof Oakland, in the county of 5 A ameda and State of California, have invented certain new. and useful Improvements in Thermostats, of whichthe followinis a specification.

y invention-relates to improvements in 10 thermostats.

The object of my invention is to provide a thermostat or thermo switch which can be so adjusted that a radiator, for' example, in connection `with which it may be used,

l1|; havingreached the/ desired temperature, the

circuit will be opened,.and t e same not closed again until the radiator has cooled to the amount of several degrees`of heat.

Other advantages of my invention' will hereinafter appear.

My invention' consists in the 'combination and arrangement of parts shown in the accompanying drawing, described in the-followingr specification and claimed in the apzs pended claims.

Referring to the accompanyinn drawing,-

the same 1s an elevation, of said. thermostat.

In the drawing, a bar 39 ris composed of' a-strip of steel as its upper layer anda strip ayer,

by screws 4311s shown. A bar 40 is composed of a.. stri of copper asits' upperylaye'r anda strip o Steel as its lower layer, the

same being also held in place by-said screws 43 as shown. A. link 4 5 is brazed on the freelend of said bar. and the upper do 47 is fitted into said link. The'npper en 4of lsaid link is rovided with a roller 46." A

.40 spring bar 48 as itsinner side of copper and its outer side of s teel, the saine bein ,brazed together,- said spring bar-is united to the lower dog 54 at itsup v r endend at its bottom to post 49, prefere ly o f brass.`

The part constitutes a coil andA 87 isa square laminated core which is slidable u wardly and downwardly ln 'said coil,A t c said core beingffitted at. ita` upper end*l to post or rod/49;`

50 51 represents"a'bl'acket'connectedto:rod

Fiberv insulationf52 isheld'yl'l'i. place by screw 72.-. 56 designates ai contact. holder.. andv a-rrn B5. fOr'colntact carbon.'57.

' represents Insulation held; 1n\

the said strips blowing-01T vvdog 54, t v

drawing arm.45.out.wardly. The operation. .of the steam heat on the lsprmgbgid.thermo- 61, said base 61 being held by' screwsto bracket 62.

63 is a carbon contact. Insulated'fram'e 40 by its screw 70 being tapped into-contact l 63holdsl it firml in place;4 and said screw also acts as a-bin ingipostfor wire 82. Gontact cai-bon 64 isscrewed into insulating fiber 65, which'l in turn is screwedinto base 66 'said base beingmounted on said` fiber.

67 is an adjusting screw. tappedthrough bar 39.

68 represents 'a lock nut.v A wire 81 is soldered into carbon 64 and fixed under binding post 71. A wire 80 connected as shown completes the-circuit. to the coil 50.

41 and 42 re resent adjusting screws.

141 is an ad]ustable stop screw` for laminated core 87.

' 142 shows an adjusting screwy turnable iny a xed support asshown; and143 is a tensionv ring connected. to link 45.

438 s ows an 'ironbase plate.

A safet valve 73 is..controflled.byl handle 74and, t e-circuit. may` be brokenby hot steam,.esca ing from'said.safet valve, contactingwit .thermo bars 39 an 40.

As soon as the steampressure reaches the oint. as. set. by. the suitable safetyvalve, 3, the steam generated escapes and isblown againstand aroundthe thermobars 39 and 40.y The. said barsas well4 as barv 48 are constructed ofdissimilar metals so asto expand uneqlgll on the applicatonof heat-resultingi l ng the strips.'I Thereu n. the downwardmovement or b endmg of he bar. 40 carriesthe brackdtholdmg the dog 47. downwardly. andsbar. 39 bending upwardly underthe inu'enceofftheheat allows the'arm 45 of the dog 47 to Ahe drawn outwardly causing dog 447 tonnlatch from he tensionfspring 143"a1d1n'g 1n .bar 48causes. the said bar to d slightly .whioh'aids in dog 54 releasing' itself from dog, 47. Theunlocking ofdogs 54. and 47 causes the laminated core 87,',wh1ch v1s .con-

nected as shown' to drop byl gravity. As y .core 87 falls, bracket ann 51 which holds 40 and 4s lcarbon contacts 57 and 58 together drops tacts 63 and 64 to come together', closing the circuit through themagnet coil50, which is now in series with the electric/heating unit. Tracing the circuit as it now stands we have electric connection by wire 7 7 to binding post 76, by wire 79 through coil 50, by wire 80 to binding post 71, by wire 8l lto carbon 64, through ca'rbons 64 and 63 'to connection 70, by wire 82 to connection 60, by wire 78 to the electric heating unit.' 'This closed circuit as it now stands causes coil 5'0 vto raise the laminated core 87, causing do 54 to catch on dog 47. Arm 51 which is 'astened to the core simultaneously raises arm 56, bringing carbons57 and 58 together. The device is now on the running circuit, 4the switching circuit being in shunt, 'causes the magnet coil to weaken on account of receiving little or no current, and relaxing its-'upward pull on the laminated core 87-this allows the full weight of the core and its parts to hang on dog 47, which causes part 40 to bend downwardly slightly, breaking the two carbons` 64 and 63 apart, whereby the switching circuit is opened, allowing the full load now to be carried-over the wire 77 to-connection 76'by arm 56 through carbons 57 and '58, by spring .arm 59, by connection 60, by4

wire 78 to and` in series with the electric heating, unit. A current conducting -wire leads to terminal post' 7 6, and 78 is such wire leading to contactarm 59 beneath screw 60.

The device does away with the necessity of turning on lor o Jthe current by hand j when in the case of a steam radiator, wherein the steamJ is generated by an electric current consuming element or unit, the said radiator reaches the desired temperature. rThe device may also be used asa safety device aid automatic shut-od for steam boilers that are used -tor steam cooking, providing .that said boilers are heated by an electric current, and may also be so used for electricheated hot water boilers.

I claim 1. ln a thermostat, an electric coil, a slidable core extending through said coil. and

havingy a post leading upwardly therefrom;y

a resilient thermo-bar secured tov the'upper end of said post; an upper horizontal thermo-bar 'secured at one end; a lower horizontal thermo-bar secured at one end;

a resilient link connected-to the `free end of said lower horizontal thermo-bar and Inovlably engaging the underside 'of said upper The break v being co-iihorizontal thermo-bar inpproximity to its free end; separable locking-mechanism connecting and between said link and said reboniii connection with said upper horizontal thermo-bar, and a lower contact-.carboni opposed to said contact-carbon and supported by said lower thermo-bar; a contact carbon below said lower horizontal thermobar and resiliently supported by an arm iiXed atl one end and extending from said contact-carbon; a i 4contact-carbon opposed to lthe contact-carbon last vmentioned and supported lby said post and having a pivoted a'rm in connection therewith; currentconducting means connected to said pivoted arin and running from said pivoted varm to andl inv connection with said upper.

Contact carbon7 current conducting means running to said pivoted arm and in-connection with said arm, and 'current-conduct-V ing means in connection with said'fiXed arm andf-` vextendingy to and 1n connection with said lower contact-carbon.

v 2. In a thermostatythe combination of an electric coil, through said coil and having a-post leading aslidable core extending upwardly therefrom; a resilient thermo- 'bar secured to the upper end of said post;

an upper horizontal thermo-bar secured at one end; a vlower horizontal thermo-bar se'- lcured at one end; a resilient link connected to the free end of said lower horizontal thermo-bar and Inovably. engaging 'the underside o'f said upper horizontal thermo-bar in proximity to its -free end; separable locking-mechanism connecting and between said link and said resilient thermo-bar; an upper contact carbon in connection with' said upper horizontal thermo-bar, vand a lower contact-carbon opposed to said contact-car.- bonand supported by said lower thermobar; a contact-carbon'below said lower horizontal thermo-bar and supportedby a iixedv support in connection therewith; a contactca'rbon 'opposed to the contact-carbon last mentioned and connected to and supported by said post; current-conducting means in connection with the contact-carbon last mentioned and extending .to and in connection with lsaid uppery contact-carbon; and `current-conducting meansl extending to and in connection with said contact-carbon -below "silient thermo-bar;l an upper contact-carv lio@ said lower horizontalthermo-bar and eX- tendingto and in connection with said lower contact-carbon.

3. In a thermostat, the'coinbiiiation with.

a safety valve of an electric coil, aslidable core .extending centrallythrough said coil and having -a post leading upwardly therefrom, a resilient thermo-bar secured to the upper end of said post; an upper horizontal thermo-bar secured at one end; a lower horizontal thermo-bar secured at one end; a

resilient link connected to the free `and of said lower horizontal thermo-bar and movnection therewith, a contact-carbon opposed. 4to the contact carbon last mentioned andv connected to andy supported by said post; current-conducting means in connection with the contact-carbon last-mentioned and extending to and in connection with said upper contact-carbon; and current conducting means extending to and in connection with said contact-carbon below said lower horizontal thermo-bar and extending to and in connection with said lower contact-cari 4. In combination with a safety valve: an -electric coil; an adjustable and slidable laminated core in said coil and having -a post leading upwardly therefrom; a resil ient thermo-bar secured to the upper end ofsaid post; a resilientl connected link above said resilient thermoar; separable locking mechanism consisting of a pair of engageable dogs between and connecting saidlink and saidresilient thermo-bar secured at one end; an upper thermo-bar engaging said link; a lower thermo-bar fixed at one end and at the other end connected to said link; a binding post above said upper thermo-bar;

ran'upper-contact carbon and a lower contact-carbon between and in connection with said upper thermo-bar and y said lower thermo-bar, said Contact carbons being separably opposed and said upper contactv carbon being in electrical connection with said binding post andv said lower contact carbon having current-conducting means in connection therewith; a contact carbon below said lower thermo-bar resiliently supported Yfrom an insulatedbase, said base having electrical connection with said lower contact-carbon; a contact carbon opposed to said resiliently supported contact carbon Aand supported on one side by said post and on the other side supported by a pivoted arm in connection therewith; electrical connection between said pivot and said coil; a current-conducting wire leading from said binding post to said coil, and current-conducting wires for electrically feeding said device and leading'to said pivoted arm and said insulated base.

In testimony whereof, I al'tix my signature in presence ofl two witnesses.

JOHANN G. WALLMANN.

Witnesses: l Y JAMES P. HoLMEs. J. F, DONEGAN. 

